Walls are now dynamically voided when joining, so you can join/unjoin voided walls

src/blenderbim/blenderbim/bim/module/model/__init__.py

@@ -4,6 +4,7 @@ from . import handler, prop, ui, grid, product, wall, slab, stair, door, window,
 classes = (
     product.AddTypeInstance,
     product.AlignProduct,
+    product.DynamicallyVoidProduct,
     workspace.Hotkey,
     wall.JoinWall,
     wall.AlignWall,

src/blenderbim/blenderbim/bim/module/model/product.py

@@ -120,6 +120,37 @@ class AlignProduct(bpy.types.Operator):
         return results
 
 
+class DynamicallyVoidProduct(bpy.types.Operator):
+    bl_idname = "bim.dynamically_void_product"
+    bl_label = "Dynamically Void Product"
+    bl_options = {"REGISTER", "UNDO"}
+    obj: bpy.props.StringProperty()
+
+    def execute(self, context):
+        obj = bpy.data.objects.get(self.obj)
+        product = IfcStore.get_file().by_id(obj.BIMObjectProperties.ifc_definition_id)
+        if not product.HasOpenings:
+            return {"FINISHED"}
+        if [m for m in obj.modifiers if m.type == "BOOLEAN"]:
+            return {"FINISHED"}
+        representation = ifcopenshell.util.representation.get_representation(product, "Model", "Body", "MODEL_VIEW")
+        if not representation:
+            return {"FINISHED"}
+        was_edit_mode = obj.mode == "EDIT"
+        if was_edit_mode:
+            bpy.ops.object.mode_set(mode="OBJECT")
+        bpy.ops.bim.switch_representation(
+            obj=obj.name,
+            should_switch_all_meshes=True,
+            should_reload=True,
+            ifc_definition_id=representation.id(),
+            disable_opening_subtractions=True,
+        )
+        if was_edit_mode:
+            bpy.ops.object.mode_set(mode="EDIT")
+        return {"FINISHED"}
+
+
 def generate_box(usecase_path, ifc_file, settings):
     box_context = ifcopenshell.util.representation.get_context(ifc_file, "Model", "Box", "MODEL_VIEW")
     if not box_context:

src/blenderbim/blenderbim/bim/module/model/wall.py

@@ -33,23 +33,7 @@ def mode_callback(obj, data):
         parametric = ifcopenshell.util.element.get_psets(product).get("EPset_Parametric")
         if not parametric or parametric["Engine"] != "BlenderBIM.DumbWall":
             return
-        if product.HasOpenings:
+        bpy.ops.bim.dynamically_void_product(obj=obj.name)
-            if [m for m in obj.modifiers if m.type == "BOOLEAN"]:
-                continue
-            representation = ifcopenshell.util.representation.get_representation(
-                product, "Model", "Body", "MODEL_VIEW"
-            )
-            if not representation:
-                continue
-            bpy.ops.object.mode_set(mode='OBJECT')
-            bpy.ops.bim.switch_representation(
-                obj=obj.name,
-                should_switch_all_meshes=True,
-                should_reload=True,
-                ifc_definition_id=representation.id(),
-                disable_opening_subtractions=True,
-            )
-            bpy.ops.object.mode_set(mode='EDIT')
         IfcStore.edited_objs.add(obj)
         bm = bmesh.from_edit_mesh(obj.data)
         bmesh.ops.dissolve_limit(bm, angle_limit=pi / 180 * 1, verts=bm.verts, edges=bm.edges)
@@ -103,6 +87,8 @@ class JoinWall(bpy.types.Operator):
 
     def execute(self, context):
         selected_objs = context.selected_objects
+        for obj in selected_objs:
+            bpy.ops.bim.dynamically_void_product(obj=obj.name)
         if len(selected_objs) == 0:
             return {"FINISHED"}
         if not self.join_type: